Incandescent electric lamp



(No Model.)

0. M. BALL.

INGANDESOENT ELECTRIC LAMP.

No. 303,202. Patented Aug. 5, 1884.-

ill'll'lll' NITED STATES PATnN'r since.

CLINTON M. BALL, OF VVATERVLIET, NEW YORK.

INCANDESCENT ELECTRIC LAMP.

EPECIBICATION forming part of Letters Patent No. 303,202, dated August 5, 1884.

Application filed April 11, 188i. Renewed May 7, 1884.

To all whom it may concern.-

Be it known that I, CLINTON M. BALL, of Watervliet, Albany county, and State of New York, have invented a certain new and useful Improvement in Electriclncandescent Lamps, of which the following is a specification, reference being had to the accompanying drawings and the letters of reference marked thereon, which form a part of this specification.

The object ofthis invention is to construct an incandescent electric lamp in separate parts in such a manner as to admit of ready connection and adjustment of the metallic electrodes or connections with the carbon or other lightgiving body in the lamp, and in packing the joint between the opposed bearingsurfaces with an elastic or plastic material, whereby the separate parts, when assembled together to form the inclosing-globe or vacuum-chamber for the electric light, are adapted to be held firmly in position after the exhaustion, and the required vacuum to be maintained by atmospheric pressure acting on the outer surfaces in contradistinction to mechanical fastening or uniting means.

My invention will be more fully hereinafter described, and pointed out in the claims.

Figure]. represents a vertical sectional view of my improved lamp. Fig. 2 represents an enlarged sectional View of one side of the neck and seal.

In the annexed drawings, the letter A represents a glass vacuumbulb or chamber common to lamps of this class, formed with aprolongation or neck, A. It will be observed by reference to the drawings that the outer end of this neck is somewhat re-enforced and provided with a concave surface formed by upsetting the glass while hot in a mold.

The letter 13 represents the wire-support, made of glass or any other suitable nonconductor of electricity, impervious to the atmosphere under pressure. This wiresupport, made with an inward-projecting extension, B, to support and define the position of the metallic conductors within the lamp, is formed with a lateral extension or flange, preferably recessed on its inner side for the reception of (N0 model.)

agasket of rubber or equivalent elastic pack ing, P, substantially as seen.

In Fig. 2, which is a vertical section of one side of the neck A and a lateral extension of the, wire-support, is shown on an enlarged scale the concave surfaces of the two bearing parts and the intermediate packing. This lateral extension of the wire-support constitutes one of the opposed bearing-surfaces in the complete lamp, and prevents the forcing of the wire support into the bulb by atmospheric pressure.

The letters 0 0 represent the metallic condoctors, of proper length, embedded and hermetically sealed in the wire-support, and connected in the usual manner to the carbon or otherlight-giving body, F, by means of clamps or other devices.

The parts constituting the incandescent electric lamp are united or assembled together by connecting, as already stated, the carbon or other 1ight-giving body to the metallic conductors O G, embedded and sealed in their support 13, and then centrally introducing the carboninto the vacuum bulb or chamber until arrested by the bearing-surface of the wiresupport coming in contact with an intermediate packing arranged against the opposed bearing-surface of the bulb or chamber. The elastic or plastic packing 1?, interposed between these bearing-surfaces, is preferably employed to make a quick and ready air-tight joint. The air is exhausted from the bulb or chamber in the well-known manner of eX- hausting in this class of inventions. This construction and arrangement of the parts defines the location and position of the light-giving body Within the vacuum-chamber and provents the forcing of the wire-supports into the said chamber.

It will now be observed that the atmospheric pressure, acting upon the several parts in con junction With the elasticity of the'packing, serves to maintain the vacuum in the bulb or chamber when once obtained. The surfaces which bear upon the elastic packing, either one or both, are made with advantage slightly concave, thereby forcing the packing from stantial, cheap, and durable lamp is produced,

and one in which the carbon may be readily replaced without destroying the bulb or globe. The mode of manufacturing the insulating wire-support or closing-cap, and the same as,

a new manufacture or a new article of manufacture, will form the subject of another application; hence no claim is herein presented for such improvements.

Having thus fully described and set forth the nature of my invention and how the same is made operative, I wish to state that I do not claim, broadly, a vacuum-chamber the parts of which are adapted to be heldtogether by atmospheric pressure; but

What I do claim as my invention, and desire to secure by Letters Patent, is

1. The combination of the exhausted bulb 0r chamber of an electric lamp, having an out wardly-extended bearing-surface and a wire support or a closing-cap provided with a flange or enlargement facing and constituting an op posed bearing surface, such surfaces being made concave, with an interposed sealing-packing arranged between the bearingsurlaces, substantially as and for the purposes set forth.

2. The combination of a vacuum bulb or chamber having a neck with an outwardlyextended bearing-surface, a gasket of sealing material of corresponding dimension, and an insulating wire-support containing parts of the electrical conductor embedded therein, and provided with a flange or enlargement fitting closely over said packing, all adapted and arranged to maintain a tight joint and to/determine or locate the position of the incandescent conductor in the chamber, substantially as set forth.

3. The combination, in an electric lamp to be exhausted of atmosphere, of two parts of glass, with opposing bearing-surfaces held together by the pressure, and forming the inclosing-vessel, an elastic air-tight packing between such bearing-surfaces, and two metallic conductors passing through and embedded in one of such pieces of glass, and connected within the vessel with the incandescing filament, sub stantially as specified.

In witness whereof I have hereto set my hand this 24th day of March, 1881.

CLINTON M. BALL.

lVitnesses:

'N. DAVENPORT, A. W. Gnrns. 

